python实现三级菜单

python实现三级菜单也就是对字典列表的操作

代码段如下：

# coding:utf8
__author__ = 'bluesli'

dict = {
    'shanghai':{
        'pudong1':['xiaopudong1','xiaopudong2','xiaopudong3'],
        'pudong2':['xiaopudong1','xiaopudong2','xiaopudong3'],
        'pudong3':['xiaopudong1','xiaopudong2','xiaopudong3']
    },
    'sichuan':{
        'chengdu':['cheng1','cheng2','cheng3'],
        'guangyuan':['guang1','guang','guang3'],
        'guangyuan2':['guang1','guang','guang3'],
    },
    'beijing':{
        'chaoyang':['chao1','chao2','chaor3'],
        'tianan':['tian1','tian3w','tian3'],
        'sanli':['san1','san2','san3']
    }
}

provinces = dict.keys()
for province in provinces:
    print(province)
province = input("请输入省份")
if province in provinces:
    mayors= dict[province].keys()
    for mayor in mayors:
        print(mayor)
    mayor = input('请输入市名称')
    if mayor in mayors:
        countys = dict[province][mayor]
        for county in countys:
            print(county)
        county = input('请输入县')
        if county in countys:
            print("Bingo")

总结：

1：取得所有的字典的keys是一个列表（list）

2：对字典值的取得是通过dict['key'] 的形式取得的

3：字典里面可以嵌套多个dict和list，可以类比json格式的数据